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A146439 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 337, 337, 4357, 4357, 135183, 135183, 3521533, 3521533, 135176521, 135176521, 9933992919 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 9 X 9 example

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.0.1.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A147133 A147164 A146692 * A146785 A146572 A147211

Adjacent sequences:  A146436 A146437 A146438 * A146440 A146441 A146442

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 30 03:02 EDT 2022. Contains 357095 sequences. (Running on oeis4.)